Bell



A. ROY.

BELL. APPLICATION FILED NOV. 10, m9.

' 1,349,694. Patented Aug. 17, 1920.

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A TTORNEYS UNITED STATES PATENT OFFICE.

BELL.

Specification of Letters Patent.

Patented Aug. 17, 1920.

Application filed November 10, 1919. Serial No. 336,925.

To all whom it may concern:

Be it known that l, ALEXANDER llor, a subject of the King of Great Britain, and a resident of Huntington, in the county of Su'liolk and State of New York, have invented certain" new and useful Improvements in Bells, of which the following 18 a specification.

My invention is an improvement in burglar alarms, and has for its object to provide a bell adapted to be attached to keys, as, for instance, the keys of hotel rooms and the like, for indicating with an audlble alarm when the key is tampered with, as for 1nstanco, when one attempts to turn 1t from the outside, and which will also sound while the key is in the pocket through the mrwement of the carrier to prevent the loss of the key.

In the drawings:

.l igure 1 shows a side view of a key provided with one embodiment of the invention' r Fig. 2 is a longitudinal section through the bell;

Fig. 3 is a view similar to'Fig. 1, showing another embodiment of the invention;

Fig. 1 is a vertical section through the alarm.

In the embodiment of the invention shown in Figs. 1 and 2, the alarm is in the form of a hell 1 of i rusto-conical form, and having its small end closed, the large end being open, and a striker or clapper 2 is suspended in the bell by a resilient member 3, as, for instance, a thin plate spring.

A casing 4: of approximately the same shape as the bell, but larger, incloses the bell, the small end of the casing lapping upon the small closed end of the bell and being secured thereto by an eye bolt 5 whose eye is in the bell and to which one end of the resilient member 3 is connected.

An eye 5 has threaded engagement with the eye bolt outside of the casing 4, and this eye 6 is adapted to be connected by a ring 7 with the key, or with a number plate 8, as shown, the number plate 8 being connected by an eye 9 with the key.

The casing 4 is provided with openings indicated at 8 for the. passage of the air vibrations, and it will be obvious that the slightest movement of the key will cause the striker to strike the bell, thus making an audible alarm.

The entire mechanism is small enough to be carried in the pocket and should a guest, for instance, leave with the key in his pocket, the noise would betray the fact that the key was being'carried away. When left I in the door any manipulation of the outer end of the key would sound the alarm. Preferably, the alarm has a number, indicated at 11, impressed on the outer face thereof, the number corresponding with the number on the number plate and of the room to which the key belongs.

It will be obvious that the inclosing casing 4 might be dispensed with, and that the bell is not necessarily :Erusto-conical. As shown in Figs. 3 and l, the bell. might be of the sleigh. bell type, consisting of a spherical casing 12 having an eye 13 by means of which it may be connected to the number plate 14:. A ring 15 connects the eye to the number plate, and a similar ring 16 connects the number plate to the key 17.

The casing 12 has a slit or slot 18 of approximately one hundred eighty degrees in length, for permitting the passage of the vibrations, and to permit the material of the bell to vibrate. The clapper or striker (not shown) is a ball of suitable material within the shell or casing 12; It will be obvious that many other forms might be used with equal facility, and the bell shown in Figs. 3 and 1 might be inclosed in an inclosing casing.

I claim:

A device of the character specified comprising a flaring casing closed at one end and open at the other, a clapper within the casing near the open end and resiliently connected with the closed end, and an inclosing casing for the first named casing, said inclosing casing being secured to the closed end of the first named casing and having its walls substantially parallel with those of the said casing, and having openings near the large end of the first named casin ALEXANDER ROY. 

